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application.rb

# Use memory store for assets cache in development/test to avoid caching
# to tmp/assets, because it causes hiding of deprecation messages in
# stylesheets, sometimes break parallel_tests and doesn't always refresh
# gem stylesheets in development
config.assets.configure do |env|
  if Rails.env.development? || Rails.env.test?
    env.cache = ActiveSupport::Cache.lookup_store(:memory_store)
  end
end